krill



2 Sheets-Sheet (No Model.) 7

8 V P. A. KRILL.

SURGBONS OPERATING CHAIR.

Patented May 22,1883.

WITNESSES INVBNTOR "7 41m Jgwa W BY g I ATTORNEYS.

7' UNITED STATES PATENT OFFICE.

F. ADON KRILL, OI ,BURTON, OHIO, ASSIGNOR OF ONE-HALF TO FOREST J.

- HINKSTON, OF SAME PLACE.

SURGEONS OPERATING-CHAIR.

SPECIFICATION formingpart of Letters Patent No. 278,241, dated May22,1883.

Application filed January 29, 1893. (No model.) I

To all 'tt-hom t't may concern Be it known that I, F. ADON KRILL, ofBurton, in the county of Geauga and State of Ohio, have invented a newand useful Improvement in Surgeons Operating-Ohairs, of which thefollowing is a full, clear, and exact description, reference being badto the annexed drawings,

forming part of this specification.

This inventionrelates to surgical and invalid chairs and tables and theinvention consists of the novel construction hereinafter described andclaimed.

In the drawings, Figure 1 is a perspective view of myimprovedoperating-chair. Fig. 2 i is a longitudinal vertical section of thesame;

andFig. 3 is a rear elevation.

A indicates the supporting frame of the chair, having the seat-sectionB' pivoted centrally to its sides, and the hack-section O and the twolegsections D D hinged to the rear and front edges, respectively, of theseat-section in theusual manner. The seat-section B is provided withdownward-projecting semicircular plates or bars E, which overlap theouter sides of the frame A and add to the strength of the connection. Inthe curved edges of these plates or bars are formed a series of notches,F, with which the upward-extending ends of the bent rod G, supported 0underneath the frame A, are adapted to engage to prevent theseat-section from oscillating, and the rod G, which is held inengagement with the notched plates E by a spiral spring, H, securedhnderneath the seat-section,

5 is to he disengaged from said plates by the downward pressure of thefoot-lever I, which is fulorumed on the said rod. The toot-lever isformed of two cross-bars hinged to the forward part of frame A, andhaving their rear ends extending to opposite sides of the chair,

respectively, in such manner that they may be easily reached with thefoot from either side of the chair when the back-section is lowered to ahorizontal position.

5 I am aware tha'tareclinin g-chair has been pro vided with a singlequadrant-shapednotched -sector arranged thereunder, and aspring-actuated treadle adapted to hold the sector adjustably. Thequadrant-shapeds'ector, however, only adapts the seat for being tiltedback- A ward from a horizontal position, while in my ously disengagedfrom the notched plates.

invention thcseat'section is adaped to be tilted either forward orbackward from a horizontal plane. l

The special arrangement of the two notched 5 5 plates to overlap thesides of the supportingframe also is an important feature in myinvention, since the plates are thus adapted to serve the additionalpurpose of securing increased strength to the parts, as well as steadi-6o ness of movement to the seat-section when the latter is beingadjusted from one position to another. The cross-bars of the foot-leverIare arranged with their point of intersection di rectly over the centerof the bent rod Gr, so that 6 5 when the rear end of either bar is usedfor depressing the rod the force exerted will be brought to bearcentrally upon the rod in order that the'ends'of the rod may besimultane- 7 The back-section O and the leg-sections D D are to hesupported in the desired positions 7 by means of ratchet-bars J K,respectively. It is common to use such ratchet-bars in chairs of thisclass; but heretofore the bars, which 7 are pivoted to the under side oftheir respective sections, have been supported in stirrups independentof each other, so that a simultaneous movement could not be given to allthe sections.

To adapt the sections for a simultaneous movement I provide a frame, L,consisting of two stirrups, M N, which are suspended from the front andrear ends of the semicircular plates, and the rods O,'which connectthestirrnps together and hold them rigidly in a given position. Theframe L is thus adapted to move with the seat-section, and consequentlywhen the ratchet-bars J K are placed in engagement with said frame L asingle adjustment of the 0 seat-section will suffice to give a similaradjustment to the other sections. A certain degree of elasticity may besecured to the back and leg sections,if desired, by slightly curving theconnecting-rods of the stirrups. 5

'The two ratchet-bars J of the hack-section are to be connected togetherby a cross-rod, and the said bars are to be lifted out of engagementwiththe stirrups N by a cord, P, connected to the center of the saidcross-rod, I00 and passed through an eye underneath the seat-section,and having two branches extending thence to opposite sidesof the chair,where they may be conveniently reached. The ends of the cord may bepassed through perforations in the rear ends of the plates E, andprovided with rings or knots to prevent them from being accidentallywithdrawn. The ratchet-bars K of the two leg-sections are arrangedindependent of each other in order that the two sections may be adjusteddifferently, and consequently each of the bars K is provided with acord, P, arranged as above described, and having branches extendingthrough perforations in the forward ends of the plates E at oppositesides of the chair.

When the leg-sections are adjusted in the same plane the foot-rest Q,which is removable and adjustable up and down the said sections, is tobe attached, as shown in Fig. 1. This rest consists of a bar or board,It, having a bent rod, S, secured to each end, which rods are adapted topass under the leg-sections and engage with ratchet-bars T, securedthereto. The ratchet-bars T are so arranged as to form edges at thesides, upon which heels U, connected to the rods S, are set to supportthe pressure upon the foot-rest and to hold the said rods in engagementwith the ratchets. WVith this construction the rest may be adjustedhigher or lower, as desired, or removed altogether when not wanted.

In some cases it is necessary that the feet of the patient shall bedrawn up nearly to a level with the seat, and that the leg-sectionsshall be let down out of the way. To adapt my chair for such cases Iform openings V through the leg-sections, at their upper ends, andprovide two sliding foot-rests, W, which are supported underneath theseat-section, and are adapted to be drawn out through the said openingswhen the leg-sections are let down.

The back-section may be provided with a hinged extension, X, supportedby a ratchetbar and stirrup in the'usual manner.

In defining the limits of my invention more particularly I would statethat I do not broadly claim a pivoted chair-seat having a segmental rackcombined with a lever having means for engaging the rack to holdthe-seat in a given position. Neither do I broadly claim a chair havinghinged sections or a divided leg-section and ratchet-bars and stirrupsfor adjusting the sections; but

WhatI claim as my invention, and desire to secure byLetters Patent,isp 1. The combination, with the supportingframe and the segmentalnotched plates fixed on the seat and overlapping the sides of thesupporting-frame, of a single spring-supported bar having its ends bentupward to engage both of said plates, and secured in keepers on thesides of the supporting-frame, and a lever for depressing said bar,whereby both plates may be adjusted by a single operation, as specifled.

2. The combination, with the seat-section and the back and leg sectionshaving ratchetbars pivoted to their under sides, of a supporting-framefor the ratchet-bars, consisting of two stirrups rigidly connectedtogether and secured to the seat-section, substantially as shown anddescribed.

3. The combinatiomwith the chair-seat and j Y supporting -frame, of legsections provided with recesses V, and hinged to the seat, and supportsW W, fitted to supporting guide-ways beneath the seat, whereby they maybe drawn out singly or together, as and for the purpose set forth.

F. ADON KRILL. Witnesses:

W. S. METcALFE, OLIVER GRIDLEY.

